Re: [FEATURE REQUEST] megaraid2 driver

[Fabien Salvi <fabien@cri74.org>]

Lester Hightower a écrit :
> Atul / readers of linux-scsi,

 > [...]

> Yesterday we ran a test where we pulled a drive from a logical drive set
> that had a hot spare.  The MegaRaid card rebuilt automatically, and after
> we inserted a fresh disk it automatically marked as a hot spare.  That
> went well, however, it took almost two hours to rebuild 73G on u320 disks
> in raid-1, which surprised me since the Mylex Acceleraid 170 (u160) took
> less than an hour in the same test.  

Well, not very surprising. Speed can vary from one manufacturer to another.
It also depends of the priority given to this task...

> One thing the DAC960 driver does is publish the real-time progress of a
> rebuild operation, both in /proc and by klog every few minutes.  The Linux
> MegaRaid driver is completely silent start to finish, only showing that it
> is in a Rebuild state.  Because the DAC960 card had already given us an
> idea of how much time to expect the rebuild to take, the second hour that
> the MegaRaid consumed was unnerving, and primarily due to the fact that we
> had no rebuild progress indication available to us.

It's not the driver's job to display this...

> I searched through all of the structs in megariad2.h and do not readily
> see any data available that would indicate the progress of a rebuild, else
> I would code this myself and submit a patch.  Instead I am asking Atul,
> and anyone else with expertise in this area, for assistance or advice in
> implementing that feature.

You should look at userland utilities to manager your RAID controller.
I've not tested them with megaraid2 driver, but you should look at 
LSILogic support web site to get utilities (GAM, Megamgr, etc...).

-- 
Fabien SALVI
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